Preheat your oven to 425°F and line a large baking sheet with parchment paper, then place a wire cooling rack on top of the parchment.
Pat the chicken wings completely dry with paper towels; removing moisture is the key to achieving a crispy skin without deep frying.
In a large mixing bowl, combine the baking powder, smoked paprika, garlic powder, sea salt, and black pepper.
Add the wings to the bowl and toss thoroughly until every wing is evenly coated in the seasoning mixture.
Arrange the wings on the wire rack in a single layer, ensuring they are not touching to allow for proper air circulation.
Bake for 35 to 40 minutes, flipping the wings halfway through, until the skin is golden brown and very crispy.
While the wings roast, whisk together the unsweetened BBQ sauce, hot sauce, and apple cider vinegar in a small saucepan over low heat until warmed through.
Transfer the crispy wings to a clean bowl, pour the spicy BBQ sauce over them, and toss gently to coat.
Serve the wings immediately alongside fresh celery stalks for a cooling crunch.